A pilot of the third grade "Math Their Way" program was conducted in eight classrooms in five Portland (OR) elementary schools during the 1983-84 school year. The eight teachers selected by principals expressed interest in participating in the pilot. The pilot teachers were supported by year-long inservice training conducted by the project coordinator (who also developed the curriculum). Fall to spring math achievement gains for the total 150 students were greater than average gains for the third grade district-wide. When achievement gains were considered by each of the eight participating classrooms, results were diverse; gains ranged from significant positive gains to gains which were equal to the District average. Some error is associated with statistical interpretations due to the small size of the eight pilot classes; all but one contained fewer than 25 students. Student attitudes toward math were surveyed before and after the pilot implementation. Both before and after, students reported positive feelings about math, and their math ability. Principals considered the teacher inservice program outstanding. The project coordinator provided year-long support through group instruction, weekly classroom planning, in-class instructional modeling and team-teaching, with on-going opportunities for supplementary planning assistance. (Author)